Soil Boron Toxicity (depth to toxic layer)

Boron is an essential trace element occurring naturally in soil, but is toxic to many agricultural plants at high concentrations. High boron levels are often associated with windblown deposition of marine sediments, lower rainfall areas and impermeable clay layers (due to reduced leaching). Mapping shows the estimated average depth to toxic boron levels, while detailed proportion data are supplied for calculating respective areas of each boron toxicity class (spatial data statistics).

硼是土壤中天然存在的必需微量元素，但高浓度时对许多农作物具有毒性。高硼含量通常与海洋沉积物的风成沉积、降雨量较低的区域以及不透水黏土层（因淋溶作用减弱）相关。制图显示了达到硼中毒水平的估计平均深度，同时提供了详细的比例数据，用于计算各硼中毒等级的相应面积（空间数据统计）。